##ry . mo ##ult ##rie saw sullivan ' s island , a sandy spit of land at the entrance to charleston harbor extending north about 4 miles ( 6 @ . @ 4 km ) long and a few hundred yards wide , as a place well suited to build a fort that could protect the entrance from int ##rud ##ing enemy warships . a large vessel sailing into charleston first had to cross charleston bar , a series of submerged sho ##als lying about 8 miles ( 13 km ) southeast of the city , and then pass by the southern end of sullivan ' s island as it entered the channel to the inner harbor . later it would also have to pass the northern end
##ry. moultrie saw sullivan's island, a sandy spit of land at the entrance to charleston harbor extending north about 4 miles ( 6 @. @ 4 km ) long and a few hundred yards wide, as a place well suited to build a fort that could protect the entrance from intruding enemy warships. a large vessel sailing into charleston first had to cross charleston bar, a series of submerged shoals lying about 8 miles ( 13 km ) southeast of the city, and then pass by the southern end of sullivan's island as it entered the channel to the inner harbor. later it would also have to pass the northern end